Method of spraying



Oct. 1, 1929.

w. a. THOMPSON 1,729,634

METHOD OF SPRAYING Filed Kay 10, 1926 In 0677 for 45 www by MW flffo 1 7mg Patented Oct. 1, 1929 1,729,634

UNITED STATES PATENT OFFICE WAYNE THOMPSON, F WINCHESTER, MASSACHUSETTS METHOD OF SPRAYING Application filed May 10, 1926. Serial No. 107,868.

The present invention relates to the art of the spray gun disclosed in my application Spraying, and more particularly to the art of filed November 6, 1925, Serial No. 67,266. In spraying liquids which have a strong tendthis gun, as in many spray guns, the material eney to clog spray guns, such for instance as to be sprayed and the motive agent, such as water glass. air under pressure, are discharged through Substances sold under the name of water a central orifice in the front face 2 of the gun glass are silicates of sodium, or potassium, and the cloud so discharged is acted upon by or both. lVater glass has many industrial supplemental jets of motive agent discharged uses among which may be mentioned, as an. through supplemental jet members 3.

to addition to yellow or laundry soaps; as a The material to be sprayed, in this instance 6 fixative of pigments in calico printing; as a a liquid, having a strong tendency to clog vehicle for pigments in fresco painting; for the spray gun, such as water glass, is conrendering cloth and paper draperies nonducted to the spray gun I from a header 4 inflammable; as a preservative of timber and through a conduit 5 connecting to a fitting porous stone; in the manufacture of artificial 6 on the body of the spray gun 1. The motive 65 stone; and in cement mixtures for glass, potagent under pressure, such as compressed air, tery, wood and leather. In making one type is conducted to the spray gun 1 from a header of asbestos pipe covering the asbestos is first 7 through a conduit 8 connected to a fitting 9 corrugated and then coated with Water glass carried by the handle 10 of the spray gun 1.

so that when the coated and corrugated If the spray gun is used to discharge the 70 asbestos is baked the corrugations will bewater glass and the compressed air supplied come permanently set. It is highly desirable to it through the conduits 5 and 8, respecthat the coating of water glass be applied to tively, the water glass Will become deposited the corrugated sheet of asbestos with a spray on the front face 2 of the spray gun 1. This gun but heretofore this has been impractideposit of water glass hardens and builds up cable owing to the tendency of the water sufficlently to close not only the orifice on the glass to clog the gun. face 2 but the orifices of the supplemental jet The object of the present invention is to members 3 thus putting the gun out of comprovide a methodof supplying spray guns mission.

with fluids for discharge therefrom in order In order to prevent the water glass from 8 to make spray guns available for use in indepositing on the face 2 of the gun the comdustry for spraying a liquid having a tendpressed air is treated to render it cool or it eney to clog such, for instance, as Water glass. may be treated to render it moist. If the To the accomplishment of this object, and surface 2 is maintained cool or moist and such others as may hereinafter appear, the preferably both cool and moist the particles various features of the invention relate to of water glass which are deposited on the certain methods hereinafter described and surface 2 by eddy currents cannot stick on then set forth in detail in the appended and are soon blown off. Preferably the comclaims which possess advantages readily appressed air is provided with cold water so 40 parent to those skilled in the art. that it is supersaturated and thus rendered The various features of the present invenboth cool and moist. This cold water is tion will be readily understood from an insprayed on the surface 2 so that the particles s )ection of the accompanying drawings of water glass which may be deposited thereis owing the best method of practising the on by eddy currents cannot stick and are soon 45 invention at present known to the inventor, blown off on to the surface being treated with in which, the water glass. The water with which the The figure is an elevation of an apparatus compressed air is provided is carried in a for use in supplying a spray gun with fluids header 1] from which it is forced into the air for discharge therefrom. conduit 8 through an angle needle valve 12 00 The spray gun 1 maybe, and preferably is, controlled by a handle 13 on one end of the W0 needle stem 14. The valve 12 is connected to the water header 11 and air conduit 8 by pipe connections 15 and 16, respectively. Only a small amount of water is needed. This water is, however, under a higher pressure than the air pressure in order to prevent the air 5 blowing back from the conduit 8 through the needle valve 12.

It will be understood that the invention is not limited in its application to any specific form of spray gun or to any specific apparatus for supplying the spray gun with fluids for discharge therefrom, but that it may be successfully practisedwvith the aid of a great variety of mechanisms or apparatus, the foregoing being intended by way of explanation rather than limitation.

What is claimed as new, is:

1. That improvement in the art of spraying Water glass with a spray gun which consists in conducting the water glass to the spray gun, conducting a motive agent under pressure to the spray gun, and providing the motive agent with cold water before its discharge from the gun.

2. That improvement in the art of spraying water glass with a spray gun which consists in conducting the water glass to the spray gun, conducting a motive agent under pressure to the spray gun, and providing the motive agent with moisture before its discharge from the gun.

In testimony whereof I have signed my name to this specification. WAYNE B. THOMPSON. 

